Nitroprusside, its metabolites and red cell function View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1978-03

AUTHORS

J. du Cailar, J. C. Mathieu-Daude, J. Deschodt, Y. Lamarche, C. Castel

ABSTRACT

The effects on metabolism and red cell function of blood levels of thiocyanate (SCN-) and cyanide (CN-) were studied in 42 patients undergoing surgery under controlled hypotension (CH) induced by sodium nitroprusside (SNP). The mean dosage of SNP administered was 21.38 mg (SD = 12). The durating of perfusion was 121 minutes (SD = 11). All operations were performed under neuroleptanalgesia without complications. No tachyphylaxis was encountered. Under SNP a slight increase of blood SCN- (from 13.9 mg/l +/- 1.1 to 23 mg/l +/- 2.6) was found. Blood levels of CN- are increased mostly in the red cell, the mean value being 0.300 mg/l +/- 0.10 for whole blood after two hours of perfusion. This value decreased when perfusion was stopped. All blood samples were negative for methaemoglobin and cyanmethaemoglobin. Carbonic anhydrase activity was not modified, CN- toxicity levels for this enzyme being 50 times higher than those found during our study. 2,3-DPG levels did not vary. Blood gases, acid-base balance and Davo2 did not change significantly, although a slight increase in blood lactate was measured. As shown by this study, appreciable amounts of CN- are detected in blood during SNP perfusion while SCN- stays at relatively low levels. Fortunately most of the CN- released from SNP moves into the red cell and does not alter its functions at clinical concentrations. The low plasma concentration of CN- is not sufficient to cause important metabolic disturbances. However, dosages of SNP higher than those administered during this study could increase the blood and tissue CN- to toxic levels. A toxicity study shows that, during a relatively short period of time, SNP dosage should not exceed 1.16 mg/kg or a maximum of 10 microgram/kg/min for a period of two hours. More... »

PAGES

92-105

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf03005064

DOI

http://dx.doi.org/10.1007/bf03005064

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1022167861

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/638835


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52 schema:description The effects on metabolism and red cell function of blood levels of thiocyanate (SCN-) and cyanide (CN-) were studied in 42 patients undergoing surgery under controlled hypotension (CH) induced by sodium nitroprusside (SNP). The mean dosage of SNP administered was 21.38 mg (SD = 12). The durating of perfusion was 121 minutes (SD = 11). All operations were performed under neuroleptanalgesia without complications. No tachyphylaxis was encountered. Under SNP a slight increase of blood SCN- (from 13.9 mg/l +/- 1.1 to 23 mg/l +/- 2.6) was found. Blood levels of CN- are increased mostly in the red cell, the mean value being 0.300 mg/l +/- 0.10 for whole blood after two hours of perfusion. This value decreased when perfusion was stopped. All blood samples were negative for methaemoglobin and cyanmethaemoglobin. Carbonic anhydrase activity was not modified, CN- toxicity levels for this enzyme being 50 times higher than those found during our study. 2,3-DPG levels did not vary. Blood gases, acid-base balance and Davo2 did not change significantly, although a slight increase in blood lactate was measured. As shown by this study, appreciable amounts of CN- are detected in blood during SNP perfusion while SCN- stays at relatively low levels. Fortunately most of the CN- released from SNP moves into the red cell and does not alter its functions at clinical concentrations. The low plasma concentration of CN- is not sufficient to cause important metabolic disturbances. However, dosages of SNP higher than those administered during this study could increase the blood and tissue CN- to toxic levels. A toxicity study shows that, during a relatively short period of time, SNP dosage should not exceed 1.16 mg/kg or a maximum of 10 microgram/kg/min for a period of two hours.
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